Rock-cutter.



UNTTED STATES PATENT OFFICE.

ROBERT TEMPLE, OF DENVER, COLORADO, ASSIGNOR TO THE TEMPLE ENGINEERINGCOMPANY, OF DENVER, COLORADO, A CORPORATION 0F COLORADO.

ROCK-CUTTER.

Specification of Letters Patent.

Patented Sept. 5, 1911'.

Application filed May 2*?, 190'?. Serial No. 375,971.

To all whom it may concern:

Be it known that I, ROBERT TEMPLE, -a citizen of the United States,residing in the city and county of Deliver, State of Colorado, haveinvented certain new and useful Tmprovements in Rock-Cutters, of whichthe following is a specification.

My invention relates in general to mining machinery, andmoreparticularly to rock cutters.

Tn the use of rock cutters, as, for instance, in making tunnels inmines, cutting edges become dull through contact with the rock or othermaterial, so that the cutters must be frequently sharpened to maintainthe desired efficiency.

The primary object of my invention is to provide a rock cutter, thecutters of which when dull may be readily detached from the supportinghead and reformed to sharpen their cutting edges.

A further object of my invention is to provide a rock cutter comprisinga plurality of separate cutters each having a plurality of cutting edgeswhich may be successively presented to the work so that the cutters maybe used a number of times before requiring reforming to replace the wornaway edges.

The embodiment of my invention herein disclosed may be generallydescribed as consisting of a cutter head having parallel series ofelongated holes therethrough, clamping blocks having bolts extendingthrough the holes in the series, cutters each having a plurality ofcutting edges removably supported upon the head by the clamping blocksin parallel rows, the clamping blocks being interposed between thecutters in adjacent rows, whereby the cutters may be adjusted tosuccessively present their cutting edges toward the work and may bedetached from the head to be reformed when all of their cutting edgesare worn.

My invention will be more fully described herein with reference to theaccompanying drawings in which the same is illustrated as embodied in aconvenient and practical form, and in which- Figure 1 is a plan view,and Fig. 2 is in part an end elevational view and in part a transversesectional view on line 2, Fig. 1.

Similar reference characters are used to designate similar parts in theseveral figures of the drawings.

Reference character A designates a head upon which rock cutters aresupported, such head being provided with suitable means, as, forinstance, a socket a on the under surface thereof by means of which thehead is se cured to the end of a reciprocating bar. The head A isprovided with parallel undercut flanges or ribs A and A2 along the edgesthereof at the sides of the surface upon which the cutters aresupported. The ends of the head are preferably curved, as indicated inFig. 1. The head A is preferably cored out, as shown inv Fig. 2, therebydecreasing its weight without unduly reducing` its strength. A pluralityof parallel series of elongated holes extend through the head A, suchseries of holes being designated by reference characters as to as,inclusive. The adjacent series of holes are spaced equal distances apartwhile the series of holes a and as are spaced inwardly from the sideflanges A and A2 a distance corresponding to the distance between theadjacent series of holes.

` Supported upon the outer surface of the head A intermediate of theflanges A and A2 and the adjacent series of holes a, as, andintermediate of the adjacent series of holes, are cutters preferablyprovided with a plurality of cutting edges, such cutters being shown astriangular in cross section, thereby comprising three cutting edges.

B designates the central series of cutters which are supported betweenthe rows of holes a* and a5.

Located on opposite sides of the central series B of cutters are seriessuch as indicated at B2, while other series B3 are located on oppositesides of the series B2. Series of cutters B5 are located along the sidesof the head and engage the side flanges A and A2, while series ofcutters B4 are located intermediate of the series B3 and B5.

In order that the cutters may be detachably secured to the supportinghead A, clamping blocks C are provided having` bolts 0 secured theretoand extending through the elongated holes through the head. Nuts 0engage the ends of the'bolts c which project through the head A. Theclamping blocks C are of a shape to fit between the cutters in adjacentrows and when the cutters are triangular the clamping blocks are wedgeshaped so as to securely clamp the cutters to the head.

The cutters are initially as long as canbe dull the clamps Care removedby disconnect,

ing the nuts c from the bolts 0, whereupon the cutters are turned withrespect to theV lhead so that the sharp cutting edges are presented tothe work. The cutters may in this manner be adjusted with respect to thesupporting head so as to present successively the cutting edges to thework until all of the edges are dull, when it is necessary to -reformthe cutters to -replace the worn away metal. v

As the reforming ofv t-he cutters shortens them, it is necessary thatthe clamping blocks 'C should be adjusted with respect to the supportinghead in order that the blocks lnay be so located with respect tothe'cutters as to clamp the cutters at opposite ends to the supportinghead. Such adjustment of the clamping blocks is permitted `by reason ofthe slots through which the bolts of the clamping blocks extend, beingelongated. It is, therefore, evident that it is possible to reform thecutters a number of times before they become too short for their use.

By forming the supporting head with curved yends the lengths of theseveral rows of cutters varies, the row at the center being longest andthe rows between the center row and the sides of the head beingprogressively shorter.V It is, therefore, possible to utilize cutters ofvarious lengths and still have the rows of cutters correspondapproximately jln .length to the length of t-he supporting ead. V

From the foregoing description it will be observed that I have inventedan improved rock cutting implement by means of which the cutters arecapable of being used a long time, owing `to their being provided with aplurality of cutting edges vand also by reforming the cutters to replacethe worn away edges.

IVhile I have described more or -less precisely the details ofconstruction 4in Which I have illustrated by invention as embodied, yetVI do not wish to be understood as limiting myselfV to any particularlformor shape of supporting head or cutters,- as it is obvious that mylinvention is capable of :being embodied in various specific forms.

I-Iaving now fully described my invention, what I claim and desire tosecure by Letters -Patent, is-

y 1. In a Arock cutter, the combination with a supporting head, of aplurality of parallel unequal rows of cutters of different lengths,clamps intermediate of the rows of cutters for detachably securing thecutters to said head, and means for adj ustably securing said clamps tosaid head.

2. In a rock cutter, the combination with a supporting head, of aplurality of independent rows of separate cutters, the cutters in eachrow being arranged end to end, and means intermediate of the adjacentrows for simultaneously engaging and thereby detachably securing thecutters in adjacent rows to the head.

3. In a rock cutter, the combination with a supporting head, of a seriesof cutters each having a plurality of cutting edges, clamps forremovably securing the cutters to the head so that the cutting edges maybe successively presented to the work, and means for adjust-ablysecuring said clamps to said head.

4. In a rock cutter, the combination with a supporting head, of a series-of triangular cutters, clamps for detachably securing said cutters tosaid head so that the cutters may be adjusted to successively presenttheir cutting edges to the work, and means for adjustably securing saidclamps to said head.

5. In a rock cutter, the combination with a supporting head, of aplurality of independent rows of separate cutters, clamps in terposedbetween and simultaneously engaging the cutters in adjacent rows, andmeans for detachably securing said clamps to the head.

6. In a rock cutter, the combination with a supporting head, of aplurality of parallel independent rows of separate cutters, the cuttersin each row being arranged end to end, clampingblocks interposed betweenand simultaneously engaging the cutters in adjacent rows, and means fordetachably securing the clamping blocks to said head.

7. In a rock cutter, the combination with a supporting head having aplurality of parallel rows of elongated holes there through, of aplurality of cutters arranged in rows upon said head intermediate ofthel rows of holes therethrough, clamping blocks movably interposedbetween the adjacent rows of cutters, bolts secured to said clampingblocks and extending through the holes in said head, and fasteningdevices engaging said bolts for retaining the clamping blocks inposition to secure the cutters to said head.

RBERT TEMPLE. Witnesses:

Guo. L. WILKINSON, W. T. JONES.

`Copies of this patent may be obtained for ve cents each, by addressingthe Commissioner of Patents,

i i n Vlashington, D. C.

